With Trafalgar Square as a famous meeting point, what city requires their cab drivers to take a test called "the Knowledge"?

If you thought your last exam was tough, try becoming a London cabby. The cabbies in the City of Fog have to pass an exam called "The Knowledge", which involves memorizing 25,000 city streets, along with landmarks and businesses. Do you think you have what it takes to be a London cabby?

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